反应详情

Sodium hydride (1.40 g, 58 mmol) was added portionwise to a solution of (E)-3-(3-hydroxy-4-methoxy-phenyl)-acrylic acid (5.15 g, 26.5 mmol) in THF (100 mL) at 0° C. The resulting mixture was allowed to reach the RT, and acetic anhydride (4 mL, 42.4 mmol) was added. After stirring at reflux temperature for 6 hrs, the reaction mixture was concentrated under reduced pressure. The residue was taken up with AcOEt, and washed with water, aqueous sodium hydrogencarbonate, and brine. The organic layer was then dried over sodium sulphate and evaporated. The resulting raw material was triturated with AcOEt. After filtration and drying, 4.7 g of the title (E)-3-(3-acetoxy-4-methoxy-phenyl)-acrylic acid were obtained, as a white powder.

1. additionwas added
2. temperatureat reflux temperature for 6 hrs
3. concentrationthe reaction mixture was concentrated under reduced pressure
4. washwashed with water, aqueous sodium hydrogencarbonate, and brine
5. dry with materialThe organic layer was then dried over sodium sulphate
6. customevaporated
7. customThe resulting raw material was triturated with AcOEt
8. filtrationAfter filtration
9. customdrying